/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ltk.internal.ui.refactoring;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.ltk.core.refactoring.TextEditBasedChange;
import org.eclipse.ltk.ui.refactoring.IChangePreviewViewer;

public class ChangePreviewViewerDescriptor /*extends AbstractDescriptor*/ {

//	private static final String EXT_ID= "changePreviewViewers"; //$NON-NLS-1$

//	private static DescriptorManager fgDescriptions= new DescriptorManager(EXT_ID, "change") { //$NON-NLS-1$
//		protected AbstractDescriptor createDescriptor(IConfigurationElement element) {
//			return new ChangePreviewViewerDescriptor(element);
//		}
//	};

    private final Class<? extends TextEditChangePreviewViewer> clazz;

    public ChangePreviewViewerDescriptor(Class<? extends TextEditChangePreviewViewer> clazz) {
        this.clazz = clazz;
    }

    private static ChangePreviewViewerDescriptor changePreviewViewerDescriptor =
            new ChangePreviewViewerDescriptor(TextEditChangePreviewViewer.class);


    public static ChangePreviewViewerDescriptor get(Object element) throws CoreException {
        if (element instanceof TextEditBasedChange) {
            return changePreviewViewerDescriptor;
        }
        return null;
//        return fgDescriptions.get(element.getClass());
    }

//	public ChangePreviewViewerDescriptor(IConfigurationElement element) {
//		super(element);
//	}

    public IChangePreviewViewer createViewer() throws CoreException {
//        return (IChangePreviewViewer)fConfigurationElement.createExecutableExtension(CLASS);
        try {
            return clazz.newInstance();
        } catch (InstantiationException | IllegalAccessException e) {
            throw new CoreException(new Status(IStatus.ERROR, "", e.getMessage(), e));
        }
    }
}
